STM32L021D4 datasheet(80/114 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32L021x4

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DocID027982 Rev 5

Figure 25. Recommended NRST pin protection

1. The reset network protects the device against parasitic resets.

2. The external capacitor must be placed as close as possible to the device.

3. The user must ensure that the level on the NRST pin can go below the VIL(NRST) max level specified in

Table 52. Otherwise the reset will not be taken into account by the device.

6.3.15

12-bit ADC characteristics

Unless otherwise specified, the parameters given in Table 53 are values derived from tests

performed under ambient temperature, fPCLK frequency and VDDA supply voltage conditions

summarized in Table 17: General operating conditions.

Note:

It is recommended to perform a calibration after each power-up.

Table 53. ADC characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VDDA

Analog supply voltage for

ADC ON

Fast channel

1.65

3.6

Standard channels

1.75(1)

-3.6

IDDA (ADC)

Current consumption of the

ADC on VDDA

1.14 Msps

200

µA

10 ksps

Current consumption of the

ADC on VDD(2)

1.14 Msps

10 ksps

fADC

ADC clock frequency

Voltage scaling Range 1

0.14

MHz

Voltage scaling Range 2

0.14

Voltage scaling Range 3

0.14

fS(3)

Sampling rate

0.05

1.14

MHz

fTRIG(3)

External trigger frequency

fADC = 16 MHz,

16-bit resolution

941

kHz

1/fADC

VAIN

Conversion voltage range

VDDA

RAIN(3)

External input impedance

See Equation 1 and

Table 54 for details

RADC(3)(4) Sampling switch resistance

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